01592897

Component

https://doi.org/10.3141/2570-11

The fuel economy and emissions of conventional and hybrid buses equipped with emissions aftertreatment were evaluated via computational simulation for six representative city bus drive cycles. Both series and parallel configurations for the hybrid case were studied. The simulation results indicated that series hybrid buses have the greatest overall advantage in fuel economy. The series and parallel hybrid buses were predicted to produce similar carbon monoxide and hydrocarbon tailpipe emissions but were also predicted to have reduced tailpipe emissions of nitrogen oxides compared with the conventional bus in higher speed cycles. For the New York bus cycle, which has the lowest average speed among the cycles evaluated, the series bus tailpipe emissions were somewhat higher than they were for the conventional bus; the parallel hybrid bus had significantly lower tailpipe emissions. All three bus power trains were found to require periodic active diesel particulate filter regeneration to maintain control of particulate matter. Plug-in operation of series hybrid buses appears to offer significant fuel economy benefits and is easily employed because of the relatively large battery capacity that is typical of the series hybrid configuration.

01590543

16-3928

English

pp 97–106

2016

Transportation Research Record: Journal of the Transportation Research Board

9780309369923

Print

Figures (8) ; References (29) ; Tables (3)

Fuel conservation; Pollutants; Power trains; Simulation; Transit buses

Energy; Environment; Public Transportation; Vehicles and Equipment

PRP, TRIS, TRB, ATRI

Jan 12 2016 5:43PM

• Assessment of the Carbon Footprint Reductions of Tricycle Logistics Services
• Comparison of Vehicle-Specific Fuel Use and Emissions Models Based on Externally and Internally Observable Activity Data
• Deriving Local Operating Distributions to Estimate Transit Bus Emissions Across an Urban Network
• Development of Macroscopic Emission Estimation Model Based on Microscopic Operating Modes
• Emissions Analysis for a Transit Corridor Under Different Improvement Strategies
• Emissions Modeling with MOVES and EMFAC to Assess the Potential for a Transportation Project to Create Particulate Matter Hot Spots
• Estimating Project-Level Vehicle Emissions with Vissim and MOVES-Matrix
• Evaluation of Light-Duty Gasoline Vehicle Rated Fuel Economy Based on In-Use Measurements
• Measuring Pedestrian Exposure to PM-2.5: Case of the Seattle, Washington, International District
• Microsimulation-Based Emissions Modeling for a Major Infrastructure Renewal Plan: Assessment of Network Attributes and Land Use Effects on Vehicular Emissions
• Modeled Effects of Traffic Fleet Composition on the Toxicity of Volatile Organic Compound Emissions
• Modeling Criteria and Air Toxic Pollutants in Light-Duty Biodiesel Exhaust
• Operations and Emissions Characteristics of Light-Duty Vehicles on Ramps
• Optimized Adjustment of Speed Resolution and Time Alignment Data for Improving Emissions Estimations